I know it sucks having to do this but I think it might work against you if you don't. Are you planning on trying to climb the career ladder there or is it any old corporate job? If you have an HR dept you could ask if they can make an exception because of your anxiety of public speaking? But it might not be the best start to your position there if you plan on raising through the ranks.
If you can get yourself to do it, I'd be plane jane - so for pics I'd say: pictures of outings you've been on that are completely and utterly normal like a walk, a day out in a small town or a hike to some unexciting place, pics of mediocre sightseeing spots, pics of a cake or some food you made or ate, or your houseplants - all things that pretty much everyone does or has and that won't give away anything about you in the slightest. If they're mediorce pics all the better
Just be enthusiastic about the most boring stuff and people will leave you alone and will not pay attention at the presentation either.